Author:Nkosi, D; Pillay, J; Ozoemena, KI; Nouneh, K; Oyama, MDate:Jan 2010The electron transfer dynamics and electrocatalytic behaviour of ferrocene-terminated self-assembled monolayers (SAMs), co-adsorbed with single-walled carbon nanotubes (SWCNTs) on a gold electrode, have been interrogated for the first time. ...Read more
Author:Bohlin, C; Jonsson, LJ; Roth, Robyn L; Van Zyl, WHDate:Sep 2006Laccases are copper-containing phenol-oxidizing enzymes that are useful in many different applications, for example in lignocellulose processing and textile industry. Efficient and convenient systems for heterologous expression are needed for ...Read more
Author:Mavuso, MA; Makgwane, Peter R; Ray, Suprakas SDate:Apr 2020Herein, we report the enhanced photocatalytic activity of heterostructured CeO2 nanocatalysts interfaced with Cu, Co, Ni, Mn, and Fe metal oxides. The CeO2 catalysts exhibited an enhanced red shift in the visible-light response compared to ...Read more
Author:Malibo, Petrus M; Makgwane, Peter R; Baker, PGDate:Jun 2020In this paper, we report on the synthesis of heterostructured V2O5/SnO2 nanocatalysts with varying vanadium metal loadings of 5–30 wt%. The catalytic performance of the designed catalysts was evaluated in the oxidation reaction of furfural ...Read more
Author:Bickerton, IBDate:Feb 1984In this report available historical information on Heuningnes estuary is presented. The threat posed by high water levels in the Heuningnes, to the farmland situated on the coastal plain of Bredasdorp reduces the possibility of leaving the ...Read more
Author:Peach, S; Vorster, J; Van Heerden, Renier PDate:May 2010In this paper the authors explore heuristic attacks against graphical password generators. A new trend is emerging to use user clickable pictures to generate passwords. This technique of authentication can be successfully used for - for example ...Read more
Author:Grobler, J; Engelbrecht, AP; Kendall, G; Yadavallie, VSSDate:Apr 2015This paper expands on the concept of heuristic space diversity and investigates various strategies for the management of heuristic space diversity within the context of a meta-hyper-heuristic algorithm in search of greater performance benefits. ...Read more
Author:Grobler, J; Engelbrecht, AP; Kendall, G; Yadavalli, VSSDate:Jul 2014This paper introduces the concept of heuristic space diversity and investigates various strategies for the management of heuristic space diversity within the context of a meta-hyper-heuristic algorithm. Evaluation on a diverse set of ...Read more
Author:Grobler, J; Engelbrecht, AP; Kendall, G; Yadavalli, VSSDate:Jul 2014This paper introduces the concept of heuristic space diversity and investigates various strategies for the management of heuristic space diversity within the context of a meta-hyper-heuristic algorithm. Evaluation on a diverse set of ...Read more
Author:Andrew, JE; Grzeskowiak, V; Kerr, IDate:Oct 2009Hexenuronic acid (HexA) is formed during kraft pulping by the conversion of 4-O-methyl-glucuronic acid groups in strong alkali conditions. HexA can be removed from the pulp by including an acid hydrolysis (A) stage in the bleaching sequence. ...Read more
Author:Du Preez, Ilse; Richter, Wim; Van Papendorp, D; Joubert, ADate:2018Much research over the past five decades has focussed on the repair and replacement of bone. Recently, the research focus has shifted to nanotechnology since it provides a platform from which to alter and possibly improve materials’ properties. ...Read more
Author:Saasa, Valentine R; Malwela, Thomas; Lemmer, Yolandy; Beukes, M; Mwakikunga, Bonex WDate:Oct 2020Hierarchical nanostructured Co-doped WO3 with carbon as template has been successfully synthesised through facile sol-gel method. The synthesised Co-doped WO3 was characterized by X-ray diffraction, Scanning electron microscopy, Transmission ...Read more
Author:Raju, Kumar; Ozoemena, KIDate:Dec 2015High-performance electrochemical capacitors will drive the next-generation portable, flexible and wearable electronics. Unlike the conventional all-carbon supercapacitors (electric double layer capacitors, EDLC) with high power but poor energy ...Read more
Author:Earle, AC; Saxe, AM; Rosman, Benjamin SDate:Aug 2017Hierarchical reinforcement learning methods offer a powerful means of planning flexible behavior in complicated domains. However, learning an appropriate hierarchical decomposition of a domain into subtasks remains a substantial challenge. ...Read more
Author:Earle, AC; Saxe, AM; Rosman, Benjamin SDate:Apr 2018Hierarchical reinforcement learning methods offer a powerful means of planning flexible behavior in complicated domains. However, learning an appropriate hierarchical decomposition of a domain into subtasks remains a substantial challenge. ...Read more
Author:Saxe, AM; Earle, AC; Rosman, Benjamin SDate:Aug 2017Hierarchical architectures are critical to the scalability of reinforcement learning methods. Most current hierarchical frameworks execute actions serially, with macro-actions comprising sequences of primitive actions. We propose a novel ...Read more
Author:Botha, RC; Koen, W; Esser, MJD; Bollig, C; Combrinck, WL; Von Bergmann, M; Strauss, Hencharl JDate:Feb 2015A 1314 nm two-crystal Nd:YLF laser was designed and operated in both CW and actively Q-switched modes. Maximum CW output of 26.5 W resulted from 125 W of combined incident pump power. Active Q-switching was obtained by inserting a Brewster-cut ...Read more